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glvideoflip: incorporate the aspect ratio into the scale_x calculations

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1. Otherwise rotating the video will clip and show black bars due to
   gltransformation's implementation.
2. The other option of make gltransformation aspect-agnostic produces
   incorrect output with perspective transformations.
This commit is contained in:
Matthew Waters 2016-01-25 19:11:38 +11:00
parent 6f80d5c59a
commit 3cf98f7e5e
2 changed files with 66 additions and 40 deletions
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104
ext/gl/gstglvideoflip.c
View file

@ -101,8 +101,7 @@ gst_video_flip_method_get_type (void)
#define gst_gl_video_flip_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLVideoFlip, gst_gl_video_flip,
GST_TYPE_BIN, GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT,
"glvideoflip", 0, "glvideoflip element");
);
"glvideoflip", 0, "glvideoflip element"););
static void gst_gl_video_flip_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
@ -148,6 +147,8 @@ gst_gl_video_flip_init (GstGLVideoFlip * flip)
gboolean res = TRUE;
GstPad *pad;
flip->aspect = 1.0;
flip->input_capsfilter = gst_element_factory_make ("capsfilter", NULL);
res &= gst_bin_add (GST_BIN (flip), flip->input_capsfilter);
@ -200,6 +201,55 @@ gst_gl_video_flip_init (GstGLVideoFlip * flip)
}
}
/* with object lock */
static void
_set_active_method (GstGLVideoFlip * vf, GstGLVideoFlipMethod method)
{
gfloat rot_z = 0., scale_x = 1.0, scale_y = 1.0;
switch (method) {
case GST_GL_VIDEO_FLIP_METHOD_IDENTITY:
break;
case GST_GL_VIDEO_FLIP_METHOD_90R:
scale_x *= vf->aspect;
scale_y *= 1. / vf->aspect;
rot_z = 90.;
break;
case GST_GL_VIDEO_FLIP_METHOD_180:
rot_z = 180.;
break;
case GST_GL_VIDEO_FLIP_METHOD_90L:
scale_x *= vf->aspect;
scale_y *= 1. / vf->aspect;
rot_z = 270.;
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_HORIZ:
scale_x *= -1.;
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_UR_LL:
scale_x *= -vf->aspect;
scale_y *= 1. / vf->aspect;
rot_z = 90.;
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_VERT:
scale_x *= -1.;
rot_z = 180.;
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_UL_LR:
scale_x *= -vf->aspect;
scale_y *= 1. / vf->aspect;
rot_z = 270.;
break;
default:
break;
}
vf->active_method = method;
GST_OBJECT_UNLOCK (vf);
g_object_set (vf->transformation, "rotation-z", rot_z, "scale-x", scale_x,
"scale-y", scale_y, NULL);
GST_OBJECT_LOCK (vf);
}
static void
gst_gl_video_flip_set_method (GstGLVideoFlip * vf, GstGLVideoFlipMethod method,
gboolean from_tag)
@ -217,45 +267,9 @@ gst_gl_video_flip_set_method (GstGLVideoFlip * vf, GstGLVideoFlipMethod method,
else
method = vf->method;
if (method != vf->active_method) {
vf->active_method = method;
GST_OBJECT_UNLOCK (vf);
_set_active_method (vf, method);
g_object_set (vf->transformation, "rotation-x", 0., "rotation-y", 0.,
"rotation-z", 0., "scale-x", 1., "scale-y", 1., NULL);
switch (method) {
case GST_GL_VIDEO_FLIP_METHOD_IDENTITY:
break;
case GST_GL_VIDEO_FLIP_METHOD_90R:
g_object_set (vf->transformation, "rotation-z", 90., NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_180:
g_object_set (vf->transformation, "rotation-z", 180., NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_90L:
g_object_set (vf->transformation, "rotation-z", 270., NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_HORIZ:
g_object_set (vf->transformation, "scale-x", -1., NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_UR_LL:
g_object_set (vf->transformation, "scale-x", -1., "rotation-z", 90.,
NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_VERT:
g_object_set (vf->transformation, "scale-x", -1., "rotation-z", 180.,
NULL);
break;
case GST_GL_VIDEO_FLIP_METHOD_FLIP_UL_LR:
g_object_set (vf->transformation, "scale-x", -1., "rotation-z", 270.,
NULL);
break;
default:
break;
}
} else {
GST_OBJECT_UNLOCK (vf);
}
GST_OBJECT_UNLOCK (vf);
}
static void
@ -394,8 +408,18 @@ _input_sink_probe (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
case GST_EVENT_CAPS:{
GstCaps *caps, *output, *templ;
GstPad *srcpad;
GstVideoInfo v_info;
gst_event_parse_caps (event, &caps);
GST_OBJECT_LOCK (vf);
if (gst_video_info_from_caps (&v_info, caps))
vf->aspect =
(gfloat) GST_VIDEO_INFO_WIDTH (&v_info) /
(gfloat) GST_VIDEO_INFO_HEIGHT (&v_info);
else
vf->aspect = 1.0;
_set_active_method (vf, vf->active_method);
GST_OBJECT_UNLOCK (vf);
output = _transform_caps (vf, GST_PAD_SINK, caps);

2
ext/gl/gstglvideoflip.h
View file

@ -79,6 +79,8 @@ struct _GstGLVideoFlip
GstGLVideoFlipMethod method;
GstGLVideoFlipMethod tag_method;
GstGLVideoFlipMethod active_method;
gfloat aspect;
};
struct _GstGLVideoFlipClass